Method for slime control

Abstract

These chemical formulations and agents are to be used as water treatment agents in industrial water systems to control and improve such factors as bacteriological contamination, pollution and cleanliness. Chemical limes, hydrosulfites and dispersants are used together in a formulation, in relatively low concentrations, to primarily inhibit and destroy slime and microorganisms. No toxicants as such are needed. In addition, the chemical lime particles can be coated to give a delayed and safer reaction with water and to give reduced dusting.

I claim: 
     
       1. A method for slime control in water systems wherein is added to said water system a chemical formulation comprising chemical lime, pitch dispersing agent, sodium hydrosulfite, antifoaming agent, and a water soluble organic surfactant, wherein the formulation is added to said water system in an amount from 1. to 5,000. parts per million by weight of said chemical formulation, wherein the formulation contains 20 to 80 percent chemical lime, 0.1 to 15. percent water soluble organic surfactant, 5. to 35. percent pitch dispersing agent, 5. to 40. percent sodium hydrosulfite, 1. to 15. percent antifoaming agent. 
     
     
       2. A method according to claim 1 wherein the pitch dispersing agent is an anionic polymeric dispersant with chelant and the water soluble organic surfactant is an non-ionic alkylarylpolyether alcohol. 
     
     
       3. A process according to claim 2 wherein the system is the aqueous system of a pulp fiber and paper mill system. 
     
     
       4. A method according to claim 1 wherein the chemical lime particles are coated with a surfactant, or optionally, with a surfactant-sodium silicate combination. 
     
     
       5. A method according to claim 4 wherein the chemical lime particles are coated with a 100% active non-ionic surfactant in which said surfactant is a primary aliphatic oxyalkylated alcohol. 
     
     
       6. A method according to claim 4 wherein the sodium silicate consists of silica at weight ratio 3.75 to sodium oxide and viscosity of the sodium silicate is 200 to 7,000 centipoises at about 20° centigrade. 
     
     
       7. A process according to claim 1, wherein the aqueous solution includes biocidal formulations. 
     
     
       8. A process according to claim 1, wherein the water system is a laundry cleaning and soaking water solution. 
     
     
       9. A process according to claim 1 wherein the aqueous system is treated with the formulation at a concentration of 3 to 15 parts per million, for a period of 1/2 to 1 hour, and at a pH of 5 to 8. 
     
     
       10. A process for slime control in aqueous systems wherein is added to said aqueous system a chemical formulation consisting of 60 percent calcium and dolomitic limes, 5 percent anionic polymeric dispersant with chelant, 5 percent nonionic alkylarylpolyether alcohol, 10 percent antifoaming agent, 20 percent hydrosulfite, and wherein the formulation is added to the mill system in an amount from 5 to 100 parts by weight of said formulation, and optionally, the formulation can contain calcium and dolomitic limes coated with the surfactant. 
     
     
       11. A method for slime control in water systems wherein is added to said water system a chemical formulation comprising chemical lime, pitch dispersing agent, sodium hydrosulfite, antifoaming agent, and a water soluble organic surfactant, wherein the formulation is added to said water system in an amount from 0.01 to 5,000. parts per million by weight of said chemical formulation, wherein the formulation contains 20 to 80 percent chemical lime, 0.1 to 15. percent water soluble organic surfactant, 5. to 35. percent pitch dispersing agent, 5. to 40. percent sodium hydrosulfite, 1. to 15. percent antifoaming agent.